Caramitu Alina Ruxandra, Lungu Magdalena Valentina, Ciobanu Romeo Cristian, Ion Ioana, Marin Mihai, Marinescu Virgil, Pintea Jana, Aradoaei Sebastian, Schreiner Oliver Daniel
National Institute for Research and Development in Electrical Engineering ICPE-CA Bucharest, 030138 Bucharest, Romania.
Department of Electrical Measurements and Materials, Gheorghe Asachi Technical University, 700050 Iasi, Romania.
Polymers (Basel). 2024 Apr 17;16(8):1129. doi: 10.3390/polym16081129.
This paper presents the obtaining and characterization of recycled polypropylene/strontium ferrite (PP/SrFeO) polymer composite materials with applications in the electromagnetic shielding of vehicle interiors (mainly automotive electronics-carcasses) from the electromagnetic radiation emitted mainly by exterior sources-electrical lines and supply sources-in terms of the development of the new electrical vehicles. With this aim, suitable polymer composite materials were developed using SrFeO filler in two forms (powder and concentrate). The recycled PP polymer and composite materials with a PP/SrFeO weight ratio of 75/25 and 70/30 were obtained in two stages, i.e., pellets by extrusion and samples for testing through a melt injection process. The characterization of the obtained materials took into account the requirements imposed by the desired applications. It consisted of determining the mechanical and dielectric properties, and microstructure analyses, along with the determination of the resistance to the action of a temperature of 70 °C, which is higher than the temperatures created during the summer inside vehicles. The performance of these materials as electromagnetic shields was assessed through functional tests consisting of the determination of magnetic permeability and the estimation of the electromagnetic shielding efficiency (SE). The obtained results confirmed the improvement of the mechanical, dielectric, and magnetic properties of the PP/SrFeO composites compared to the selected PP polymers. It is also found that all the composite materials exhibited reflective shielding properties (SE from -71.5 dB to -56.7 dB), with very little absorption shielding. The most performant material was the composite made of PP/SrFeO powder with a weight ratio of 70/30. The promising results recommend this composite material for potential use in automotive shielding applications against electromagnetic pollution.
本文介绍了再生聚丙烯/锶铁氧体（PP/SrFeO）聚合物复合材料的制备与表征，这些材料应用于车辆内部（主要是汽车电子外壳）的电磁屏蔽，以抵御主要由外部源（电线和电源）发出的电磁辐射，这与新型电动汽车的发展相关。为此，使用两种形式（粉末和浓缩物）的SrFeO填料开发了合适的聚合物复合材料。PP/SrFeO重量比为75/25和70/30的再生PP聚合物和复合材料分两个阶段获得，即通过挤出制成颗粒，并通过熔体注射工艺制成测试样品。对所得材料的表征考虑了预期应用所提出的要求。表征包括测定机械性能和介电性能、进行微观结构分析，以及测定材料在70°C温度下的耐受性，该温度高于夏季车辆内部产生的温度。通过功能测试评估这些材料作为电磁屏蔽的性能，功能测试包括测定磁导率和估算电磁屏蔽效率（SE）。所得结果证实，与所选PP聚合物相比，PP/SrFeO复合材料的机械性能、介电性能和磁性能有所改善。还发现所有复合材料都表现出反射屏蔽特性（SE为-71.5 dB至-56.7 dB），吸收屏蔽非常小。性能最佳的材料是重量比为70/30的PP/SrFeO粉末制成的复合材料。这些有前景的结果推荐这种复合材料用于汽车屏蔽应用，以对抗电磁污染。
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